Please use this identifier to cite or link to this item:
Scopus Web of Science® Altmetric
Type: Journal article
Title: Regional geochemistry and continental heat flow: implications for the origin of the South Australian heat flow anomaly
Author: Neumann, N.
Sandiford, M.
Foden, J.
Citation: Earth and Planetary Science Letters, 2000; 183(1-2):107-120
Publisher: Elsevier Science BV
Issue Date: 2000
ISSN: 0012-821X
Statement of
Narelle Neumann, Mike Sandiford and John Foden
Abstract: Existing measurements from South Australia define a broad (> 250 km wide) zone of anomalously high surface heat flow (92 ± 10 mW m-2). This zone is centred on the western margin of the Adelaide Fold Belt (Neoproterozoic to early Phanerozoic cover floored by Palaeoproterozoic to Mesoproterozoic basement), where it borders the eastern Gawler Craton and Stuart Shelf (Palaeoproterozoic-Mesoproterozoic). To the west, in the western Gawler Craton (Archaean to Palaeoproterozoic), heat flow averages ~ 54 mW m-2 while to the east in the Willyama Inliers (Palaeoproterozoic) heat flow averages ~ 75 mW m-2. We use a regional geochemical dataset comprising > 2500 analyses to show that the anomalous heat flow zone correlates with exceptional surface heat production values, mainly hosted in Palaeoproterozoic to Mesoproterozoic granites. The median heat production of Precambrian 'basement' rocks increases from < 3 μW m-3 west of the anomalous zone to ~ 6 μW m-3 within the anomalous zone. In the highest known part of the heat flow anomaly, Mesoproterozoic gneisses and granites of the Mount Painter Province in the northern Adelaide Fold Belt yield an area-integrated mean heat production of 9.9 μW m-3. These data suggest that the anomalous heat flow reflects an unusual enrichment in U and Th in this part of the Proterozoic crust, with the total complement of these elements some 2-3 times greater than would be expected for Proterozoic crust on the basis of the global heat flow database. This extraordinary enrichment has played an important role in modulating the thermal regime of the crust in this region, and particularly its response to tectonic activity. (C) 2000 Elsevier Science B.V. All rights reserved.
Description: Copyright © 2000 Elsevier Science B.V. All rights reserved.
DOI: 10.1016/S0012-821X(00)00268-5
Description (link):
Published version:
Appears in Collections:Aurora harvest 7
Geology & Geophysics publications

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.